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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dd285ff81b1718a09449b2fb55d360293ad3be2b9bb1f24f2788db13411f03' 
  AND token = 'Qe5LloLqMq8xSdiQptr0P5J7VTOo58zGpRQVAII8lio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}